Machine for grinding and polishing ruling-wheels.



No. 684,362. Patented Oct. .8, l90i.

E. E. FLORA.

MACHINE FOR GRINDING AND POLISHING RULING WHEELS.

(Application filed Feb. 16, 1901.)

(No Model.)

UNITED STATES PATENT OFFICE.

ELLSIVORTH E. FLORA, OF CHICAGO, ILLINOIS, ASSIGNOR TO DWIGHT K. TRIPP,OF SAME PLACE.

MACHINE FOR GRINDING AND POLISHING RULlNG-WHEELS.

SPECIFICATION forming part of Letters Patent No. 684,362, dated October8, 1901.

Application filed February 16,1901. Serial No. 47,689- (No model) To aZZwhom it ntay concern.-

Be it known that I, ELLswoRTH E. FLORA, a citizen of the United States,residing at Chicago, in the county of Cook and State of Illinois, haveinvented certain new and useful Improvements in Machines for Grindingand Polishing Ruling-\Vheels, of which the following is a specification.

My invention relates to that class of mechanisms that are known asruling-wheels and which are used for ruling lines on photographicscreens, plates, sensitized paper, 850. and has for its object theproviding of a simple, economical, and efficient machine for grindingthe ruling-wheels.

The invention consists of the features, combinations, and details ofconstruction hereinafter described and claimed.

In the accompanying drawings, Figure 1 is a full-sized plan View of amachine embodying my improvements looking at it from the top; Fig. 2, anenlarged elevation of the arbor on which the ruling-wheel is held andmounted and the centers upon which it is adapted to rotate for thepurpose of grinding, and Fig. 3 an elevation of one of the spindles andcenters.

In the art to which this invention relates it is well known that inruling photographic screens, plates, printing-paper, 850., an ordi: narydraftsmans pen cannot be used with success in that the pointrapidlywears away. Even when such pens are fitted with diamond points they wearwith comparative rapidity and are also very difficult to keep inadjustment, so as to produce a large number of lines of uniform width.It has therefore become necessary to use a wheel made of hard stone andof such a class of stone that it is free from flaws. These wheels areprovided with a V-shaped periphery, the angles of which are in theneighborhood of sixty degrees on a side and provided with practically aflattened apex of the width of the line which it is desired to rule. Ithas been extremely diflicult in the past to give this ruling-wheel thedesired an gles-that is, to make both sides of the angles exactly thesame and at the same time provide a perfect apex, either of a sharp edgeor slightly flattened, and have all of such parts concentric with may begiven to the periphery of the rulingwheel.

In constructing a machine in accordance with my improvements I make abed portion A of the desired size and shape and preferably provided withtwo pedestals a and a, located at or near each end of the bed portion,so as to minimize the danger of springing the bed. Adjustably mounted onthis bed are two head-stocks B and B, provided with lathe-spindles b andI), mounted in the usual bearings, either the usual watchmakerslathe-bearing of antifriction angles or parallel bearings, which shouldbehardened, so as to reduce the amount of wear. These spindles areprovided with circular handles C and C, resembling largely the ordinaryglobe valve wheel or handle.

In order to support the arborD, upon which the ruling-Wheel D ismounted, in a manner that it may freely revolve and be fed to thegrinding mechanism, hereinafter described, I provide the lathe-spindlesof the head-stocks with centers E and E, which in this instance aredead-centersthat is, are not arranged to be rotated. These centers areplaced in the spindles eccentric to the axis of the spindies and inpositive line with each other, so that as the spindles are oscillated orrotated the arbor, with its ruling-wheel, is moved nearer to or fartherfrom the grinding mechanisms in a parallel manner, as will behereinafter more fully described.

As shown in Fig. 1 of the drawings, the arbor is mounted upon thedead-centers of both of the lathe-spindles, with the centers in linewith each other, though eccentric to the axis of the spindles. It istherefore desirable or necessary that means should be provided tooscillate these spindles with their deadcenters simultaneously that is,that they should be moved in exactly the same plane at all times, so asto carry the arbor forward and backward in a parallel manner. In orderto accomplish this result, the spindles are provided with perforationstransverse to their axis, and into these perforations are inserted thefree ends of a U-shaped handle G, so that the spindles of thehead-stocks can be oscillated simultaneously and in a parallel manner. 7

In order to show the amount of oscillation and also to tell whether bothspindles are be ing oscillated to a similar extent, the spindles areprovided with graduating-wheels H and H and the fixed portion of theheadstocks with indicators h and it. By this means it will be seen thatthe position of the head-stocks may be at all times regulated orascertained.

In order to provide means for grinding equal angles on each side of theperiphery of the ruling-wheel and to flatten the apex of the same whendesirable or necessary,a grindiug-rest I is provided and bolted orotherwise secured to the bed portion. This grindingrest is provided withthree grinding-heads I, I and I adjustably mounted in the grooves orslots I, so as to be moved backwardly and forwardly, the grinding-headsI and I being located at an angle to the bed of the lathe somewhere inthe neighborhood of thirty degrees, so that the faces of thegrinding-laps z" and 11 will grind an angle on the periphery of theruling-wheel. These laps are mounted in spindles i the necessaryrotation of which may be given by means of the grooved pulleys '5 Thegrinding-head 1 1s located at right angles to the bed of the lathe, sothat the face of its lap i will grind the rulingwheel so as to give it aperfectly flat apex parallel to the axis of the arbor upon which theruling-wheel is mounted.

In operation when it is desired to grind one face of the periphery oftheruling-wheel, as shown in Fig. 1, one of the grinding-headsis movedforward in position to contact the ruling wheel, the necessary rotationsare given to the grinding-lap and ruling-wheel, and the wheel moved intocontact with the grinding-lap by means of the handle G until the desiredamount has been taken olf of the ruling-Wheel. The operation is repeatedon the opposite side of the ruling-wheel by withdrawing the head I andmoving the head I so as to bring its lap into contact with the wheel.WVhen this lap i has performed its grinding,

it is moved backward and the head I moved forward until its lap grinds asufficient amount ofi the apex of the ruling-wheel. I claim- 1. In amachine of 'the class described, the

combination of an arbor for holding an object to be ground, two grindingdevices arranged at an acute angle to the arbor and at an obtuse angleto each other, and one grinding device arranged at right angles to thearbor, substantially as described.

2. In a machine of the class described, the

combination of an arbor for holding an object to be ground, two grindingdevices arranged at an acute angle to the arbor and at an obtuse angleto each other and severally ad j ustable toward and from the object tobe ground, and one grinding device arranged at right angles to the arborand adjustable toward and from the object to be ground, substan tiallyas described.

3. In a machine of the class described,the

combination of a bed or frameportion, two oscillating spindles mountedin line with each other so as to provide a space between them,

a center mounted eccentrically in each spindle and in line with thecenter in the opposite spindle, a grinding rest or bed, and twogrinding-heads adjustably mounted on such rest or bed opposite to eachother and at equal angles to the lathe-spindles, and meansforoscillating the spindles simultaneously, substantially as described.7

4. In a machine of the class described, the combination of a bedportion, two lathe-heads adj ustably mounted on such bed portion, 0s 7,

cillatin g spindle in each head mounted in line with the spindle in theopposite head, a center eccentrically mounted in each spindle and inline with the center in the opposite spindle,

a grinding-rest, two grinding-heads mounted t 1 on such rest opposite toeach other and at equal angles to the lathe-spindles, a thirdgrinding-head adjustably mounted on such rest at right angles to thelathe-spindles, and V means for oscillating the lathe-spindles simultaneously substantially as described.

ELLSWORTH E. FLORA. Witnesses:

THOMAS A. BANNING, THOMAS B. McGREGoR.

